grunt-contrib-watch/docs/watch-examples.md

# Examples

```js
// Simple config to run jshint any time a file is added, changed or deleted
grunt.initConfig({
  watch: {
    files: '**/*',
    tasks: ['jshint']
  }
});
```

```js
// Advanced config. Run specific tasks when specific files are added, changed or deleted.
grunt.initConfig({
  watch: {
    gruntfile: {
      files: 'Gruntfile.js',
      tasks: ['jshint:gruntfile'],
      options: {
        nocase: true
      }
    },
    src: {
      files: ['lib/*.js', 'css/**/*.scss', '!lib/dontwatch.js'],
      tasks: ['default']
    },
    test: {
      files: '<%= jshint.test.src %>',
      tasks: ['jshint:test', 'qunit']
    }
  }
});
```

# FAQs

## How do I fix the error `EMFILE: Too many opened files.`?
This is because of your system's max opened file limit. For OSX the default is very low (256). Temporarily increase your limit with `ulimit -n 10480`, the number being the new max limit.

## Can I use this with Grunt v0.3?
Yes. Although `grunt-contrib-watch` is a replacement watch task for Grunt v0.4, version `grunt-contrib-watch@0.1.x` is compatible with Grunt v0.3. `grunt-contrib-watch >= 0.2.x` is **only* compatible and recommended to use with Grunt v0.4.

## Why is the watch devouring all my memory?
Likely because of an enthusiastic pattern trying to watch thousands of files. Such as `'**/*.js'` but forgetting to exclude the `node_modules` folder with `'!node_modules/**/*.js'`. Try grouping your files within a subfolder or be more explicit with your file matching pattern.